For recordings of bird songs, call 612-673-7800, and when prompted press the following four-digit numbers:
1213 black-billed cuckoo
1214 boreal owl
1215 Eastern screech owl
1216 great crested flycatcher
1217 great horned owl
1218 long-eared owl
1219 Northern saw-whet owl
Recordings from the Library of Natural Sounds, Cornell Laboratory of Ornithology. Try the lab's website: www.birds.cornell.edu.